US 11,699,905 B2Granted

Power system and control method

AssigneeHuawei Digital Power Technologies Co., Ltd.

InventorsHualei Ju, Zhiwu Xu, Haibin Guo

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Abstract

A power system includes a controller, configured to adjust an output current of a first converter to a first current value based on a voltage of a direct current bus and a voltage threshold, where a difference between an adjusted voltage of the direct current bus and the voltage threshold is less than a difference between the unadjusted voltage of the direct current bus and the voltage threshold. The controller adjusts the output current of the first converter to a second current value based on output power of the first converter and a power threshold, where a difference between adjusted output power of the first converter and the power threshold is less than a difference between the unadjusted output power of the first converter and the power threshold. The controller adjusts the output current of the first converter based on the first current value and the second current value.

Claims20

Dependent claims

A power system, wherein the power system comprises

a first converter, wherein an input terminal of the first converter is configured to connect to a direct current bus, and an output terminal of the first converter is connected to a power grid or a load;
and
a controller configured to
control an output power of the first converter;
adjust an output current of the first converter to a first current value based on a voltage of the direct current bus and a voltage threshold, wherein a difference between an adjusted voltage of the direct current bus and the voltage threshold is less than a difference between the voltage of the direct current bus and the voltage threshold;
adjust the output current of the first converter to a second current value based on the output power of the first converter and a power threshold, wherein a difference between an adjusted output power of the first converter and the power threshold is less than a difference between the output power of the first converter and the power threshold;
and
adjust the output current of the first converter based on the first current value and the second current value.

5 more elements

A power system, comprising

a first converter, wherein an input terminal of the first converter is connected to a power grid, and an output terminal of the first converter is connected to a direct current bus;
and
a controller configured to
control an input power of the first converter;
adjust an input current of the first converter to a first current value based on a voltage of the direct current bus and a voltage threshold, wherein a difference between an adjusted voltage of the direct current bus and the voltage threshold is less than a difference between the voltage of the direct current bus and the voltage threshold;
adjust the input current of the first converter to a second current value based on the input power of the first converter and a power threshold, wherein a difference between an adjusted input power of the first converter and the power threshold is less than a difference between the input power of the first converter and the power threshold;
and
adjust the input current of the first converter based on the first current value and the second current value.

5 more elements

A control method, applied to a power system, the method comprising:

calculating a first current value based on a voltage of a direct current bus and a voltage threshold, wherein the power system comprises a first converter and a controller, the controller is configured to control an output power of the first converter, an input terminal of the first converter is connected to the direct current bus, and an output terminal of the first converter is connected to a power grid or a load, wherein, in response to an output current of the first converter being adjusted to the first current value, a difference between an adjusted voltage of the direct current bus and the voltage threshold is less than a difference between the voltage of the direct current bus and the voltage threshold;
calculating a second current value based on the output power of the first converter and a power threshold, wherein, in response to the output current of the first converter being adjusted to the second current value, a difference between adjusted output power of the first converter and the power threshold is less than a difference between the output power of the first converter and the power threshold;
and
adjusting the output current of the first converter based on the first current value and the second current value.

1 more element

Dependencies are inferred from the claim text.